/Engine/Source/Runtime/Engine/Classes/Engine/World.h
FTraceDelegate TraceDelegate; TraceDelegate.BindRaw(this, &MyActor::TraceDone);
[FTraceHandle](API\Runtime\Engine\FTraceHandle) AsyncLineTraceByObjectType ( EAsyncTraceType InTraceType, const FVector & Start, const FVector & End, const [FCollisionObjectQueryParams](API\Runtime\Engine\FCollisionObjectQueryParams) & ObjectQueryParams, const [FCollisionQueryParams](API\Runtime\Engine\FCollisionQueryParams) & Params, const FTraceDelegate * InDelegate, uint32 UserData )